Who werethe major innovators of the late nineteenth century and early twentieth century. has to be 4 people

What was the overall impact of eli whitneys introduction of interchangeable parts?

Due to their desire for a theocracy, what was at the center of new england life

Since the 700 what was the relationship between muslims and christians on the iberian peninsula? how does this relationship impact the desire of christiannations in the iberian peninsula to spread christanity?