How do you determine the possession of the football after halftime?

Answer 1

The rule is the team that kicked the ball off to start the first half, gets possession of the ball in the beginning of the second half.

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Actually, I believe that the rule is slightly different from that.

The team that wins the toss at the beginning of the game has the choice of kick, receive, choose a goal to defend or defer their first choice until the second half.

When they have chosen, then the other team has the remaining choice.

Occasionally, with a strong wind blowing, you will see the team that wins the toss choose to defend the goal that will allow them to kick with the wind.

At the beginning of the second half, there are the same choices except, of course, a team cannot defer. The team that lost the coin toss gets the first choice in the second half.