What must happen for a treaty between the United States and another country to go into effect?

it must be approved by two-thirds of the Senate before it goes into effect.

Explanation:

The United States Constitution provides that the president "shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two-thirds of the Senators present concur" (Article II, section 2). Treaties are binding agreements between nations and become part of international law.

d)to gain support for the independence movement.

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during the hitler era and it caused them to declare war on germany