Question

What evidence did wegener use to come up with the idea of continental drift?

Answer 1

Wegener's first line of evidence that the continents once formed a single landmass was the shape of the continents themselves
By ignoring the changeable coastlines and focusing instead on the continental shelves, Wegener showed that Africa and South America could fit together nearly seamlessly. In addition, the landscape of South Africa's Great Karoo is very similar to the Santa Catarina formation in Brazil. Wegener argued that they were once a single contiguous feature

Answer 2

To keep it nice and short, it's  Mountains in North America appear to be part of the same chain of mountains as those in Northern Europe.