Answer:
4 generations.
Step-by-step explanation:
The American pioneers were people who in different periods of history moved westward, settling in the new territories of the United States with the objective of populating the region, consolidating American sovereignty through the creation of new urban centers. In turn, the federal government promoted this migration to the west to precisely establish new inhabitants in the face of potential invasions by foreign nations. This situation, which began in the 1800s, was fully consolidated in the 1900s, that is, 4 generations later, with the western United States completely incorporated into the nation.