To hold off till they were all in one place
There is so many reasons but they are complicated to explain
Originally, it was all Christian groups (Protestant, Catholic, etc) that had religious freedom in colonial Pennsylvania, although later it was open to all religions of any faith.
It was called the open door policy made by Deng Xiaoping allowing foreign businesses to bet set in China paying a very low tax
The American Revolution was principally caused by colonial opposition to British attempts to impose greater control over the colonies and to make them repay the crown for its defense of them during the French and Indian War (1754–63). ... Read more about the causes of the American Revolution in the United States article