Question 4 Please Help

A b and d are the correct ones

Why was the Union’s railroad network and advantage in the civil war?

The answer to that question is A(The Union could move soldiers and materials quickly across the country.)and C(The railroad tracks were more difficult to sabotage than roadways and canals.)and B(armored railroads were used to fire on enemy positions.)

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.

b. the american revolution