Se conquistó America en 1492
I think it was because a bad winter in Russia
There were multiple causes for the Greek War of Independence. Nationalism was spreading and the Greeks wanted their own independent government. The Ottomans were suppressing the Greeks because they were the minority so the Greeks wanted a change. They also wanted Christianity.
The main cause of the civil war and strife in Sri Lanka is their ethnic composition: Tamils in the north of the Island, who want independence and Sinhala in the South who want the country to remain united.
There is also a religious difference: the Tamils are predominantly Hindu and the Sinhalese are Buddhist.