Which 1492 event signaled a turning point for the Americas?

Which country knighted early 20th century African-American painter Henry Ossawa Tanner? What year did the first African American run for president? Who invented American Eagle Outfitters of 1977? What Was Life Like For African Americans Under Slavery? What is the value of an 1852 US half dime? What city in Alabama did the civil rights march turn ugly? What is the Province was the last to join confederation in 1949? What mistake did Abraham Lincoln make? What is the value of a 1842 us silver dollar? What is value of 1965 us half dollar? How much an 1898 Queen Elizabeth front eagle at the back silver coin 1 dollar? How much would a 1854 mint condition one dollar gold piece liberty head be worth? When did the us change the size of its paper money? What issues arose between 1848-1860 leading to the outbreak of the civil war? What conditions existed in the north that might lead to problems at a later date? What quarters should be saved? Why are there so many 1964 nickels? Who was the creator of what became known as the American System? Spanish forts in America? What were the accomplishments of the corps of discovery?