Answer: Isolation
Explanation:
When George Washington stepped down as President, he advised the nation to maintain a policy of isolation from the rest of the world especially Europe, so that the country could have a chance to grow without conflict.
The United States generally followed this policy up until 1898 when they got involved in a war with the Spanish that saw them win and acquire overseas territory in the Philippines and Puerto Rico.
Zoning laws is the answer hope this helps!!!