Why did the crusades contribute to the end of the medieval era in europe?

The answer has been stated below.

Explanation:

Crusades were the war in the name religion. while creating an army for the crusades, kings began to imply taxes on the nobility and nobility had to sell off their lands and freed their serf. The central authority of the King become strong by leaving taxes on the eastern trade. The new nation-states broke the old feudal ties.

the united states presidential election of 1844 was the 15th quadrennial presidential election, held from november 1, to december 4, 1844. democrat james k. polk defeated whig henry clay in a close contest that turned on the controversial issues of slavery and the annexation of the republic of texas.

which statement best describes the relationship between the fourteenth amendment and the african american civil rights movement?