Because jure segregation can be prevented with laws, but to prevent the facto segregation it is necessary to modify people's thinking and this is very difficult to achieve.
Explanation:
The jure segregation is the one that defines the segregation of groups due to legislation that determines that these groups should be separated and not be able to frequent the same places or use the same objects. As this segregation is created by law, it can be easily ended, with another law that determines its end.
The facto segregation happens due to the prejudice and the social intolerance between groups of people that present some difference. This type of segregation is very difficult to end, because there needs to be a change in thinking in relation to prejudiced concepts that are very well established and rooted in the population.
Germany invaded Russia at the Yalta conference so they joined the soviet union to finish the war once and for all soon after the nuclear bombs were dropped in japan.
