The most abundant gas in the atmosphere is nitrogen
Most Confucian officials thought China gained little trade. They also thought that China benefited little from contact with foreigners. These officials were far move concerned with threats of invasion from Central Asia. So the Ming government ended the maritime voyages.
Columbus is a villain. He took credit like any other white man hungry for fame. He wasn't the 1st person to discover America. The vikings did but they didn't "document" the discovery as much as Christopher did. Christopher wasn't even the 1st person to spot the Americas. Christopher was completely wrong about his discovery. History continues to repeat itself over and aver again. White men suppressing minorities for their self-less gain in power. White people raped people, caused wars, slavery, dept, etc. This one of the reasons why people today have so many races in their family tree. Even white people brought over diseases from Europe. Christopher Columbus is a villain. He didn't deserve the credit.
Declining political loyalties. Hope this helps. : )
Richard Lawrence, an unemployed house painter, approached Jackson with two loaded guns. Fortunately the guns misfired. Lawrence was mentally unstable and had no connections with Jacksons political rivals. Jackson and his Vice President, Martin Van Buren, was convinced that Lawrence had been hired by the Whig Party, who were opponents of his at the time. Jacksons Democrats and the Whig Party were upset about Jacksons attempts to dismantle the Bank of the United States. Therefore, they could've tried this, but Jacksons suspicious were never proven to be true. Hope this helped! :)