The Mongol invasion of Russia — the invasion of the Mongol Empire on the territory of the Russian principalities in 1237-1240 years during the Western campaign of the Mongols (Kipchak campaign) 1236-1242, under the leadership of the chingisid Batu Khan and Subutai <span>of the warlord.
</span>So, answer : <span>Batu Khan</span>
<span>Advanced mathematics was critical to the development of the Mayan calendar. The Maya needed a system of mathematics to record celestial movements over the years, to handle large numbers, and to calculate the solar and lunar year with great precision.</span>
Columbus managed to convince "The Enterprise of the Indies" to (put what he convinced them to do here), but not King John ll of Portugal. You can also switch the order for that sentence (Columbus wasn't able to convince King John ll of Portugal, but he was successful with "The Enterprise of the Indies"). (enter name here)'s wife Felipa dies (either enter cause of death or why it relates to the previous sentence here). Hope this helps
Basically their goal was to defend the nations members from threats from the communist enemies/countries.
Like for example, France and the US would be in the United Nations/NATO and Russia and China would be the communists.
NATO is the North Atlantic Treaty Alliance between North America and Europe.
