Sentence 1: The noblemen had free rein to create their own fiefdoms.

Sentence 2: They are free to build their own fiefdoms.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: Others may pause to wonder why Connecticut--and 19 other states--needs an antitrust policy separate from that of the United States.

Sentence 2: Others might wonder why some states need their own antitrust policy.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: They held it for only a year before returning it to Spain in exchange for Florida, but during this period trade was opened up to additional markets, notably the North American colonies.

Sentence 2: They did not have to make an exchange for Florida.
Is this second sentence entailed by the first?

Answer:
no