Because those that knew the trade and worked hard for the job often did not get the job unless they knew someone. And sometimes people in the spoil system did not know how do their job. It wasn't merit based. Like is someone worked their whole life to be a doctor and a high school graduate becomes a doctor because they knew a friend who could hire them.
The machine gun was decisive in securing victories for the Allies in WW1, if that's the time period this is focused on.
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By acknowledging and learning from the past, we also embrace the present more fully and can shape our future tasks with renewed confidence, passion and commitment. There may well be people whose stories still need to be heard, whose pain needs to be acknowledge.
Under the treaty of the Guadalupe - Hidalgo , the Mexican American War ended in favor of the United States , this also relinquished the United States with 525,000 square miles of land from the Southern Border