What oath is kennedy reffering to in paragraph one of his inaugural address?

What made it difficult for mexican americans to win court cases against anglo americans who laid claim to their land

1. discovered the new world balboa 2. explored the north american southwest hudson 3. his crew was the first to sail around the world vespucci 4. conquered the incas of peru cortes 5. discovered the pacific ocean columbus 6. conquered the aztecs of mexico cabot 7. discovered fishing grounds off newfoundland pizarro 8. looted spanish vessels for england drake 9. claimed the hudson river area for dutch coronado 10. priest who explored the mississippi marquette 11. man for whom the new world is named magellan

Unlike most spanish and portuguese traders in east asia, most dutch east india company traders did what