The trend that has been true in the United States is that minorities are growing fast.
These people became wealthy mostly because of efficient trade between countries. Trading was an important factor back then, and your key word is COASTAL, meaning they are by a sea (aka trading routes). So the answer is trading between countries.
In order to form a more perfect union, establish justice, insure
domestic tranquility, provide for the common defense, promote the
general welfare, and secure the blessings of liberty to ourselves and
our posterity, do ordain and establish constitution t refers to the fairness of the distribution of benefits and burdens among persons or groups in society. It may be such things as pay for
work or the right to speak or vote. They may include almost anything
that can be distributed among a group of people that would be considered
useful or desirable, such as praise, awards, opportunities for
education, jobs, membership in organizations, or money.
hope it helps
