“What would have happened if Poland, rather than the Soviet Union, had accepted Joachim von Ribbentrop’s proposals in 1939? Would the Soviet Union have withstood an invasion of Germany allied with Poland and, perhaps, Romania and Hungary as well? That Germany and Poland did not make an alliance, and that Germany and the Soviet Union did, is perhaps the single crucial fact about the war.”

“What would have happened if Poland, rather than the Soviet Union, had accepted Joachim von Ribbentrop’s proposals in 1939? Would the Soviet Union have withstood an invasion of Germany allied with Poland and, perhaps, Romania and Hungary as well? That Germany and Poland did not make an alliance, and that Germany and the Soviet Union did, is perhaps the single crucial fact about the war.”

— Timothy Snyder