Answer:
As more railroads were built, it helped to expand the nation and the West Industries cropped up in the West and used the railroads to link industry to markets in the Eastern part of the nation.
Northwest Ordinance of 1787
General Lee surrendered a. in the village of Appomattox Court House.
it is not Bull Run, because that was the first "ligit" battle fought between opposing sides
it is not Gettysburg, because that was the turning point of the war
It is not Vicksburg, because that was a siege inplaced by the Union to finish the Anaconda Plan, which split the Confederacy into two
hope this helps
D. Remained poor.
They experienced a period of economic stagnation following the independence. Making a lot of people remained poor despite being free from the European colonization. They need some time before they eventually make adjustments to implement a proper political system in place and develop their economy.