The US and Brits wouldn't have access to Russia to send supplies and Russia is cold so both countries would have to wait till spring to counter-attack.
During the golden age of the Islamic empire, many advancements were made in lots of different areas. New forms of art were created, and new ways of thinking, including the beginnings of the mathematic system of algebra, emerged as well.
Manifest Destiny summary: In the 19th century US, Manifest Destiny was a belief that was widely held that the destiny of American settlers was to expand and move across the continent to spread their traditions and their institutions, while at the same time enlightening more primitive nations. And the American settlers of the time considered Indians and Hispanics to be inferior and therefore deserving of cultivation. The settlers considered the United States to be the best possible way to organize a country so they felt the need to remake the world in the image of their own country.
