In the united states, what percentage of unintended pregnancies is terminated by abortion?

Which situation is most likely to show a constant rate of change?

If both the president and the vice president can no longer serve, who will become the next head of state?

Of the 8 territories that were brought under the flag of the united states by 1853, which on do you think was the most important addition to the growth of the united states? give 2 reasons.