シャドーイング練習: The Monroe Doctrine Explained in 5 Minutes - 動画で英語スピーキングを学ぶ

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It's 1823.
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The map of the Americas is being redrawn.
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Spain has spent centuries amassing a new world empire stretching from Patagonia to California.
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Now their grip was slipping fast.
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One by one, Spain's colonies are declaring independence.
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And back in Europe, the old empires are not taking it well.
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They're asking themselves, what's to stop us from taking it all back?
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The United States had come into being mere decades ago in the revolution.
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Then we fought Britain again in the War of 1812.
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America was concerned of the involvement of foreign empires in the New World.
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Now, America sensed an opportunity to establish a new order.
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Britain, focused on protecting its trade with the emerging nation, proposed a joint declaration with the United States to deter intervention.
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But Secretary of State John Quincy Adams, suspicious of British motives, convinced President James Monroe to act independently.
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Monroe then declared a decree to Congress, among the boldest diplomatic statements in American history.
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The American continents, by the free and independent condition which they have assumed and maintained,
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are henceforth not to be considered as subjects for future colonization by any European powers.
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The United States, still a young frontier nation, positioned itself as the preeminent power in the new world
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and set the stage for centuries of American foreign policy in our hemisphere.
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This decree transformed America's role in standing in the global order, though initially relying on the deterrence of the British Navy to enforce it.
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For decades, the doctrine served as a defensive shield while America expanded westward.
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It was invoked when the French installed an emperor in Mexico, forcing their eventual withdrawal.
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It shaped debates over attempted annexations like the Dominican Republic.
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But these were defensive applications, keeping European powers out, not asserting American control over the hemisphere's affairs.
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changed in 1895, when Secretary of State Richard Olney invoked the doctrine,
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declaring that the United States was practically sovereign over the Western Hemisphere and demanded Britain submit to American arbitration.
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He had redefined the doctrine.
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It was no longer just a warning.
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It was now a claim to regional primacy.
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Three years later, war with Spain erupted, and when the smoke cleared, it transformed the Hemisphere.
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The United States expelled Spain from Cuba, seized Puerto Rico, and stepped into the world stage as a genuine imperial power with dominance over the Caribbean.
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Just four years later, that dominance was tested again.
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German and British warships sailed into Venezuelan waters and blockaded its ports over unpaid debts.
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Roosevelt intervened and declared if a Latin American nation fell into chaos or instability, the U.S would step in and manage it.
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The doctrine has started as a shield.
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Roosevelt had just turned it into a mandate.
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A critical opportunity for American leadership in the Western Hemisphere came in 1903, when Panama sought independence from Colombia.
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Both Europe and the U.S had long wanted a canal in Central America, allowing ships to cross from the Atlantic to the Pacific.
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After a failed French attempt, the United States saw an opening, and a region was shifting political dynamics.
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The U.S backed Panamanian independence and secured a deal to construct, operate, and defend the Panama Canal.
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The waterway would go on to become the hemisphere's most critical artery for trade, a strategic asset for both world wars,
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and a testament to America's enduring leadership in the region.
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When Soviet missiles were discovered in Cuba in 1962, Kennedy didn't need to invent a new framework.
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He simply invoked the doctrine.
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The weapons had to go.
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13 days of the most dangerous standoff in human history ended with the Soviets backing down and removing the missiles from Cuba.
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Reagan applied the same logic to justify opposition to Soviet-backed Sandinista regime in Nicaragua and other Marxist groups,
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arguing that ideological threats required the same response as military ones.
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Fast forward to the modern era, where the doctrine has found its latest champion in President Trump.
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Through the execution of Operation Absolute Resolve, the United States seized Venezuelan dictator Nicolás Maduro,
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transporting him to American soil to answer for charges of narco-terrorism.
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This calculated maneuver delivered a resident signal across the hemisphere, punctuated by President Trump's own declaration.
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Under our new national security strategy, American dominance in the Western Hemisphere will never be questioned again.
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Over two centuries, Monroe's declaration had shaped U.S foreign policy across administrations and throughout fundamentally different geopolitical eras.
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What began as a warning to European powers evolved into a framework for regional dominance,
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one that remains the cornerstone of American strategy in the hemisphere today.
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Next, we will learn about George Kennan, best known for his policy of containment during the Cold War.

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このレッスンの語彙とスピーキングのポイント

このB2レベルのスピーキングレッスンは、動画「The Monroe Doctrine Explained in 5 Minutes」を教材にしています。 繰り返し出てくる語は次のとおりです：hemisphere, doctrine, America, dominance, invoked。 この動画には、シャドーイング用の文が56文、単語が782語あります。 音声の長さは5:37です。 話す速さは1分あたり約139語で安定しており、シャドーイングしやすいペースです。 英語の頻出3,000語に含まれる単語は71%だけなので、語彙は難しめです。

この動画の重要語彙

動画の中で特に難しい単語15語を、発音と意味つきで紹介します。

単語発音意味
hemisphere 名詞/ˈhɛmɪsfɪə/半球
doctrine 名詞/ˈdɑk.tɹɪn/教義, ドクトリン
declare 動詞/dɪˈklɛɚ/宣言する
seize 動詞/ˈsiːz/捉える, つかむ
decree 名詞/dɪˈkɹiː/命令, 詔書
transform 動詞/tɹænsˈfɔɹm/変形する, 変換する
missile 名詞/ˈmɪs.aɪl/弾丸
annexation 名詞編入, 併合
colonization 名詞/kɔlənɪˈzɛjʃən/植民地化
cornerstone 名詞/ˈkɔɹ.nɚ.stoʊn/礎
henceforth 副詞/hɛnsˈfɔɹθ/今後, これ以後
preeminent 形容詞/priˈɛm ə nənt/擢んでる, 卓抜な
warship 名詞/ˈwɔɹˌʃɪp/軍艦, 戦艦
waterway 名詞/ˈwɔːtəweɪ/水路
maneuver 名詞/məˈnuvɚ/機動, 演習

この動画の文法

話し手がよく使っている文型を、動画の実際の表現とともに紹介します。

文型動画での表現
受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てるbe considered · was invoked · was tested
現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係しているhas spent · have assumed · has started

注意したい発音

  • 「th」の音: henceforth /hɛnsˈfɔɹθ/, withdrawal /wɪðˈdɹɔ(ə)l/
  • 「sh」と「zh」の音: declaration /ˌdɛk.ləˈɹeɪ.ʃən/, colonization /kɔlənɪˈzɛjʃən/, warship /ˈwɔɹˌʃɪp/, arbitration /ˌɑɹ.bɪˈtɹeɪ.ʃən/, suspicious /səˈspɪʃ.əs/
  • 長い単語（アクセントの位置に注意）: declaration /ˌdɛk.ləˈɹeɪ.ʃən/, colonization /kɔlənɪˈzɛjʃən/, preeminent /priˈɛm ə nənt/, instability /ɪnstəˈbɪlɪti/, arbitration /ˌɑɹ.bɪˈtɹeɪ.ʃən/

日本語話者が苦手な音：

  • /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: declaration /ˌdɛk.ləˈɹeɪ.ʃən/, withdrawal /wɪðˈdɹɔ(ə)l/, practically /ˈpɹæk.tɪ.k(ə.)li/
  • /v/ — /b/ にならないように、上の歯を下唇に当てる: invoke /ɪnˈvoʊk/, maneuver /məˈnuvɚ/, invent /ɪnˈvɛnt/, intervene /ˌɪntəˈviːn/, eventual /ɪˈvɛn.t͡ʃu.əl/
  • /f/ — 「フ」ではなく、上の歯と下唇で出す: hemisphere /ˈhɛmɪsfɪə/, transform /tɹænsˈfɔɹm/, henceforth /hɛnsˈfɔɹθ/, standoff /ˈstændɔf/, enforce /ɪnˈfoɹs/

この動画での練習方法

  1. まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
  2. 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
  3. 自分の声を録音して元の音声と比べます。hemisphere, doctrine, declareなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →