What city was the first and second continental congresses and the declaration of independence approved?
Philadelphia
The first and second Continental Congresses, as well as the approval of the Declaration of Independence, took place in the city of Philadelphia.
To find this answer, you could have searched for information about the location of the Continental Congresses and the approval of the Declaration of Independence. One way to do this is by using a search engine and typing phrases like "location of first Continental Congress," "location of second Continental Congress," or "where was the Declaration of Independence approved." The search results would provide information about Philadelphia being the city where these historical events occurred. Additionally, you could have consulted history books, reliable websites, or encyclopedias to gather this information.