The US became involved in World War II to oppose the aggression of -the Axis powers, including Japan, Germany, and Italy.
-the Chinese region of Manchuria.
-the Sudetenland of Czechoslovakia.
-the Allied powers, including Great Britain and France.

The axis powers, including Japan, Germany, and Italy.

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the correct answer option is: weapons.

explanation:

tensions rose as the two opposing superpowers competed for 'weapons'.

referring to the cold war (1945-1991), the two superpowers, usa and ussr, experienced a phase of struggle and conflict with each other. these two superpowers considered each other as a threat to their survival and thus opted for policies to strengthen their positions.

the two superpowers never went to war with each other directly but competed for weapons to preserve their positions.