Answer:
Pretty sure they mean The Founding Fathers as they "Built America"
Explanation:
Sorry if this doesn't help, I give slightly bad advise.
A.
After the Civil War Abraham Lincoln was just the first of many US Presidents to encourage immigration through economic and politic measures (one of them was to give free land to anyone willing to work it). The country needed people to rebuild itself and to settle the west of the continent. And everyone was aware that there is plenty of space.
B. India had many spices China had silk and there had also been many port cities in Africa so ships could get to Asia.
