Eastern Europe wanted to be independent from the Soviet Union, but did not feel strong to oppose Soviet Union: only upon its collapse could they really become independent.
And Soviet Union did not support religion: so religious groups could function more in the open after the collapse of the Soviet Union.
Answer:
because the people who develop mosque are not same and time zone of all countries are different
If you moved to Texas there was law that if you migrated farther to the west and you settled on that land for 5 years it was now your land.