Here's why it's a tricky question:
* Pre-Columbian America: Before European colonization, numerous indigenous languages were spoken across North and South America. Some estimate there were over 1,000 distinct languages. Picking a single "first" language would be like choosing a single "first" language for Europe - there was no single dominant language.
* Colonial Era: When European colonization began, languages like English, Spanish, French, and Portuguese were introduced. These languages eventually became dominant in many regions.
* Modern America: The United States officially has no national language, although English is widely spoken and considered the "de facto" language.
So, rather than a single "first language," it's more accurate to say that America's linguistic history is a tapestry woven from the contributions of many languages, both indigenous and immigrant.