OR TRY ONE OF OUR DATABASES:

Newsbank: 

Click on Gilded Age/ 1878-1913 ➡ 

Select: Spanish American War, Philippine American War

FOF: History Issues & Controversies:

Search Cuba, Alaska, Philippines ➡

Select article & click on "primary sources"

FOF: American History:

Enter keywords you've learned and narrow to primary source ➡

"Operation bootstrap", "Alaska purchase", etc.