What is the truman doctrine?
the u. s
policy to contain and challenge communism
the u. s
policy to spread totalitarianism
the soviet policy to spread communism
the soviet union policy to contain and challenge capitalism

The correct answer is: "the U.S  policy to contain and challenge communism".

The Truman Doctrine was the containment approach adopted by the US in foreign policy affairs, which aimed to stop the spread of communism and the geopolitical expansion of the URSS worldwide. It was approved in 1947. The US did not intend to use direct military actions but, instead, to participate in many proxy wars and conflicts where communism or the URSS were involved, by supporting the opposing side.

b) the confederacy had to pay all union war expenses.

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.