The Glossopteridales (Glossopteris fossils) occur on the most landmasses. Their distribution across several detached landmasses led scientists to believe that these were once merged into a single supercontinent, Pangea. Their wide distribution suggests that the continents were still together in the times of their existence (298.9 millions of years ago-252.17 millions of years ago). Scientific evidence suggests that Pangea did indeed split after this, 175 million years ago.
It is because the Americans started to see all the other countries become free and they wanted to become free to. They also started to not like the way the British treated them.