Question

why did the united states join the north atlantic treaty organization in 1949? to improve relations with communist countries in eastern europe to protect against the soviet union and the spread of communism to share a common currency across all nations within the treaty to create a policy of using military force to combat terrorism

Explanation:

The North - Atlantic Treaty Organization (NATO) was formed during the Cold - War era. The United States joined to counter the threat posed by the Soviet Union and the spread of communism. It was not about improving relations with Eastern European communist countries, sharing a common currency (which came much later in the European context), or combatting terrorism (a later - emerging concern).

Answer:

to protect against the Soviet Union and the spread of communism