United States is 12,246 times larger than Tonga.
Area: 747 km2 World Factbook
Population: 106,440 (July 2014) World Factbook
Tonga, officially the Kingdom of Tonga, is a Polynesian sovereign state and archipelago comprising 176 islands with a surface area of about 750 square kilometres scattered over 700,000 square kilometres of the southern Pacific Ocean, of which 52 are inhabited by its 103,000 people. Wikipedia
The United States of America, commonly referred to as the United States, America, and sometimes the States, is a federal republic consisting of 50 states and a federal district. The 48 contiguous states and Washington, D.C., are in central North America between Canada and Mexico. Wikipedia