No, atoms were not invented in the United States or any other country for that matter. The concept of atoms as the fundamental building blocks of matter dates back to ancient times and can be traced to the ancient Greek philosopher Democritus, who proposed the idea around the 5th century BCE. However, it is important to note that the atomic theory proposed by Democritus was purely philosophical and lacked the scientific evidence and experimental support that would come later.
The modern understanding of atoms and their structure developed over centuries through the work of numerous scientists from various countries. Some notable contributors include John Dalton (England), J.J. Thomson (England), Ernest Rutherford (New Zealand), Niels Bohr (Denmark), and many others. Their experiments and theoretical advancements paved the way for our current understanding of atoms.
While the United States has made significant contributions to atomic theory and related fields, such as nuclear physics, it would be incorrect to say that atoms were "invented" in the United States or any single country. Scientific knowledge and discoveries are the result of collaborative efforts by scientists from around the world, building upon the work of those who came before them.