Answer:
No, Congress could not
Explanation: The states had the right to decide if their state would be allowed to have slaves or not because Congress had passed the Fugitive Slave Law which said that if anybody already owned slaves they could keep them but nobody could buy slaves.
<span>This is false. While the first clause is the establishment clause, the second is the free exercise clause. It states that the government will not pass a law that will abridge the "free exercise thereof," concerning religious belief and practice. A person's religious practices, provided they do not break any applicable laws, are not to be limited by legislation.</span>