What are some ways the United States can help the cos and eastern europe

In March 1948, the United States Congress passed the Economic Cooperation Act (more popularly known as the Marshall Plan), which set aside $4 billion in aid for Western Europe. By the time the program ended nearly four years later, the United States had provided over $12 billion for European economic recovery.

Explanation:

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

i honesty don't know, good luck tho dawg