Which of these is NOT true of the era of isolationism?

A. It sought to avoid entangling alliances with foreign powers
B. It sought to avoid commercial ties with the empires of Europe
C. It was made possible in part because the vast Atlantic Ocean formed a buffer between the United States and Europe
D. The United States was during much of that era a relatively weak military power—at least in comparison with such European powers as Britain and France
E. It came to an end when Japan bombed Pearl Harbor on December 7, 1941