With new technology and greater range for such things as air missiles and rockets, these natural borders really don't provide America with more protection other than more distance from potential threats.
natural borders
Rivers, Oceans, Seas, and Mountains.
Rivers, Oceans, Seas, and Mountains.
What is a platypus's natural protection
Where America is in the next 20 years depends on the economy, environment, natural disasters, politics, and the stability of other nations.
Natural protection is a defense mechanism such as the skunk's spray. Camouflage coloring in butterflies is another form of natural protection.
The natural borders that icolate china are the Himalayins, the yellow sea, and all the deserts.
There are several of them. Between Latin America and the United States, the Rio Grande qualifies as such. Other rivers that act as natural borders between countries of the same region include the Parana, Orinoco and Usumacinta.
A geographer's pen. There are no natural borders or boundaries.
Obviously there are several naturalborders. To the west, near the state of California, you have mountains which impeded movement, thus creating a natural border. Also the two huge oceans beside it also have an impact. The natural borders to the north include trees and forested areas, as well as higher altitude ( not necessarily mountains, but higher than America.) Near the south exists vast deserts, to which communities and cities are isolated to concentrate ( more around Mexico). There are also several large mountains in the states of New Mexico creating more natural borders.
He was forced to retreat the remaining of his battered army towards France, to fight the Allied Armies, which were aiming to break through its the natural borders.
kansas