President George W. Bush's main concerns about the security of the United States relied on terrorism. This led his to advocate for the creation of defense systems around the globe.
I believe the answer to this is C.
Since America use to be part of Mexico many Mexican Americans say it to prove that it was once there land and America crossed there border.
Beringia was a frozen land bridge caused by lower water levels during the last ice age, creating a new path of travel between Eurasia and the Americas.
Beringia was an island between Eurasia and the Americas which provided a midway stop for supplies, making travel between the areas possible.
Beringia was land mass connecting Eurasia with the Americas, until it sunk completely, stranding a portion of the population in the Americas.
Beringia is an ancient grain native to Alaska, which is believed to be solely responsible for the survival of the settlers in the winter months.
Beringia was the first primitive ship built by Stone Age people, and effectively the beginning of water travel between continents.
