Answer:
The rise of communism in any country was a danger to it's neighbors.
Explanation:
Domino theory has been highly influential in US foreign policy. The war in Vietnam is a perfect example.
This is a long answer.
Strengths
Not many historians today talk about the strengths of the Articles of Confederation, likely because of how unpopular the document quickly became. The Articles did set the legislative body, Congress, as the highest power in the nation because of the fear of monarchy. Congress had the sole power to declare war, assign treaties, entertain foreign relations, and operate post offices. Disputes between states and territorial issues were to be brought to Congress. The document also stipulated that Canada was allowed to enter the Union if they desired.
Weaknesses
There were more weaknesses than strengths under the Articles of Confederation. The lack of power given to the Continental Congress strangled the federal government. The Articles gave Congress the power to pass laws but no power to enforce those laws. If a state did not support a federal law, that state could simply ignore it. Congress had no power to levy taxes or regulate trade. Without a federal court system or executive leader, there would be no way to enforce these laws, either. Amending the Articles of Confederation would also require a unanimous decision, which would be extremely difficult.
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The Transcontinental Railroad was completed in 1869.
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B.
The US never declared war on Germany because of the Poland invasion. Britain and France declared war on Germany because of the Poland invasion.
The United States was having the most problems with Japan, and the US declared war on Japan shortly after they bombed Pearl Harbor.
Once the US declared war on Japan, Germany declared war on the US due to the Tripartite Pact.