What event was the catalyst for reform during Alexander ||'s reign , and what did it show

The Crimean war - military failure and inefficiency had its roots in the backwards economy.

Explanation:

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.

it increased the power of the king of england.