What event took place in china in 1949 which to solidify the policy of containment in the us?

The correct answer is the Chinese Revolution.

This revolution took place during 1949 and was a culmination of the efforts made by the Communist party in China to take control of the government. This resulted in the creation of a communist government under the leadership of Mao Zedong on October 1, 1949.

Britain and its empire stood alone against hitler and mussolini. in june 1941, hitler broke the non-aggression agreement with stalin and germany invaded the soviet union. in december, japan attacked the us and britain. the main lines of world war ii had formed.