By 1776 how many english colonies had been established along the atlantic coast

That would be thirteen colonies.

By 1776, the British established thirteen colonies along the Atlantic coast which now is the East Coast of the United States. It was there thirteen original colonies that started the revolution and the war for independence from the rule of the British king. The colonies established Continental Congress and later became the United States of America.

X= 1.26415 the answer is above