Based on the graph and your knowledge of u. s. history, what would be the result of the change in population between 1850 and 1860? a large increase in the birthrate a large wave of immigrants from europe an increase in the number of housing units an influx of workers for new factory jobs

Based on the graph attached below, we can observe there is a sharp increase from the 1850s. The reason behind that increase is the Act of Consolidation in 1854, which the borders until that time expanded and resulted with the modern borders of Philadelphia. Indeed, the correct answer is an increase in the number of housing unit.  

Spanish conquistadors demanded labour from natives.