Americans doesn't mean all of NA or SA, it means ppl from the USA, America's mean people from NA and SA.
In english there isn't a word specifically for people from both North America and South America. You could maybe use "American" for people from both continents (native english speakers never do this), but there has to be context as whenever a native english speaker says "American", they 99.999% of the time mean a person from the United States. There is no actual specific word for people from both continents. Americas just refers to the region (North and South America) not the people. We just say North American, Central American, South American, etc. It's different in spanish where "americano" usually mean a person from both continents.
don't wanna argue so just skim through this
https://www.cde.ca.gov/be/st/ss/documents/ccssmathstandardaug2013.pdf
^ california common core
you don't learn pythagorean theorem until 8th grade fam
"you don't learn pythagorean theorem until 8th grade fam"
Brother, you're American too. And as someone who has been through the cali public education system, I can tell you that it varies based on the ability of the student. If you aren't learning pythagorean theorem until 8th grade, it's because you're on the slowest track