What is the size of Nouth America?
The United States is 3,794,000 square miles large, and South America is 6,888,000 square miles large. The US is 55.08% of the size of South America. South America is 1.815 times the size of the US. So ultimately to answer your question, No, the US is not twice as large as South America but is almost half the size (3,444,000 mi2).