Yes. Yes, the United States is indeed part of North America.
Yes, because it was part of North America.
During the time of Pangaea, North America was attached to the continents of Europe, Africa, and South America. These landmasses were all part of the supercontinent Pangaea before they eventually drifted apart to form the continents we recognize today.
Present-day land areas that were part of the supercontinent Pangaea include South America, Africa, Antarctica, Australia, India, and parts of Europe and North America. These landmasses were all connected together before the breakup of Pangaea.
The top part of Pangaea was called Laurasia. It comprised the northern portion of the supercontinent, while Gondwana made up the southern portion. Laurasia eventually split into North America, Europe, and Asia.
Greenland and Madagascar were part of the supercontinent Pangaea. Greenland was located in the northern part of Pangaea near what is now North America, while Madagascar was positioned in the southern part near present-day Africa.
Central America is very small and usually considered to be a part of North America, so when mapping Pangea its prehistoric location is probably considered irrelevant.
The northern part of Pangaea was known as Laurasia, which consisted of North America, Europe, and Asia. Laurasia eventually split apart during the Mesozoic era to form the continents we see today.
The distribution of similar rock types across continents that were once part of Pangaea, such as the Appalachian mountains in North America aligning with the Caledonian mountains in Europe and North Africa, supports the theory of Pangaea. Additionally, identical fossils, coal deposits, and rock formations found on different continents provide further evidence for the existence of the supercontinent Pangaea.
During the formation of Pangaea, the supercontinent, the continent that was roughly in the center was Africa. The modern-day landmasses of South America, North America, Europe, and Asia surrounded Africa as Pangaea formed.
Pangaea separated into Laurasia, which became North America and Eurasia, and Gondwana, which became South America, Africa, Antarctica, Australia, and the Indian subcontinent.
The Appalachians are younger than Pangaea because they were formed during the process in which North America removed itself from Pangaea and into the west.
Pangaea broke up into Gondwanaland and Laurasia over 200 million years ago.