Stephen Austin made all of the following rules for citizens of his colony except: a.

must be law-abiding

b.

must be hard-working

c.

must convert to Catholicism

d.

must be a citizen of the United States

d.  Must be a citizen of the United States.

Explanation:

Stephen Fuller Austin was the founding father of the state of Texas. He worked hard to get permission to form a state/ colony and was made an empresario by the Mexican emperor. And since the government cannot personally oversee the colony, he was made the 'ruler' of the land.

And in his role as 'founder' of the land, he made several rules for the 300 families to follow, among which are some of the points given in the question. He dictated that the immigrants be law-abiding people, hard-working, and if not a Roman Catholic, he must convert to being one. But among the options given, what was not part of the rule is that the people must be a citizen of the United States.  

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else