Answer:
Schlieffen plan.
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The answer is: Political bosses expanded their power by helping immigrants in return for their loyalty.
At that time, many of the political bosses realized that if they somehow can help the immigrants obtain their citizenship, the immigrants will become much more likely to return their favor.
This mean that they can influence the immigrants to vote for them during the election in exchange for the citizenship. This help the political bosses expanded their power.
If you're taking the connexus one heres the answers ;]
1. D(Negros have fought and died for this country)
2.C(women are left out of the political process)
3.B(the civil rights act of 1964)
4.C(these are border states that see larger numbers of immigrants)
5.A(the united states has an ethnically diverse population)
6.B & C(the DREAM act proposes support for undocumented youth to attend college & the immigration act of 1990 increased the number of permanent visas granted)
7.A & D (avoids participation in criminal activity& displays tolerance for different opinions)
8. D(being elected to political office)
9.A B or C(multiple perspectives and diverse experiences, passionate and active citizens & recognising the gap between ideals and practices)
10. C(immigration)
11. A (immigrants often come in search of economic improvement)
Good luck!!!!! ✌