Hitler focused his attention on Eastern Europe, aiming to conquer Poland and the Soviet Union.[177][178] After the occupation of Poland in 1939, all Jews living in the General Government were confined to ghettos, and those who were physically fit were required to perform compulsory labour.[312] In 1941 Hitler decided to destroy the Polish nation completely; within 15 to 20 years the General Government was to be cleared of ethnic Poles and resettled by German colonists.[313] About 3.8 to 4 million Poles would remain as slaves,[314] part of a slave labour force of 14 million the Nazis intended to create using citizens of conquered nations.[178][315]