What was the number one issue considered when a state asked to be admitted to the union

Whether the state was a slave state or a free state.

Explanation:

This was the main concern of the United States when it came to accepting a new state to the Union. This was because of the delicate balance of power that existed in the country. The strong opposition of slave states to free states (and viceversa) led to an equal number of slave and free states in the Union in order to maintain a balance of power. The admission of a new state threatened such a balance.

sir thomas more, venerated in the catholic church as saint thomas more, was an english lawyer, social philosopher, author, statesman, and noted renaissance humanist. he was also a councillor to henry viii, and lord high chancellor of england from october 1529 to 16 may 1532.