In one of the closest presidential races in history, harry truman's election in 1948 secured the fifth consecutive win for the party.

B)Democratic

Explanation: Like Franklin Roosevelt before him, Harry Truman was a Democratic. His victory in 1948 was one the biggest upsets in the history of American presidential elections, and it secured the Democrats as the nation's majority party until Eisenhower's election in 1952.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.