Please answer this correctly

How did the united states obtained the purchase of floridia to extand its frontiers to the pacific ocean

Historians have recently discovered a historical journal published in the early twentieth century. the journal contains facts based on original sources about the downfall of the early byzantium empire. historians consider this long-lost journal to be a breakthrough in their understanding of the byzantium empire. based on this information, the journal is a source.

What was the mame given to the idea that americans should expand across the nation ro the pacific coast