Me will give brainliest 5 whole points im begging yall me i need this asap be conciderate with mewhich is true of the middle colonies by the 1750s? several of the middle colonies were still struggling to build stable economies based on fishing and farming. the middle colonies were the most diverse part of the thirteen colonies because of non-english immigrants. philadelphia and new york city were both fairly small, but were beginning to develop a shipping trade that would later explode. the middle colonies had developed strong economies and a stable culture based on the same heritage and background of the people.