There is no single Americas route.
Each country has its own rules for citizenship, registration, proof, and transmission. A border crossing or birthplace can create useful records without automatically establishing nationality for descendants.
Follow the family across borders.
Migration records, civil registrations, and naturalization files can connect generations and show when status changed. The useful result is a country-specific research question, not a continent-wide checklist.
Evidence over assumptions.
Where the family line is more distant, each intermediate generation needs to be established before a present-day nationality claim can be evaluated.
Next step
The free screen is designed to tell you whether the connection is worth a closer look. The $500 Nationality Research Assessment is the point where a human researcher reconstructs the relevant line and provides a written, source-backed conclusion.