You could fit both America and Russia into Africa and still have room to spare.
Those are countries though. You can't compare a country to a continent. Apples and oranges. The continent of Eurasia is the only one larger than Africa at 55 million square kilometres.
No, South America and North America have very different crops and cultures. The Spanish and Portuguese colonized South America whereas the French and the English colonized North America.
The continent of Eurasia is the only one larger than Africa at 55 million square kilometres.