The first way they tried to solve the problem was assimilation.
This means that the US tried to change the culture of Native Americans and in essence this was a cultural transformation. They wanted the Native Americans to live by the rules and norms of the European culture. This was primarily attempted through education.
The second solution was even worse and it was removal.
The US government "relocated" the Native American tribes to different parts of the country while they continued to settle and grow as a country. Many Native American tribes resisted which led to many armed conflicts.
A. The war in Iraq
The war in Afghanistan, begun in 2001, was aimed against the al-Qaeda terror group that was based in Afghanistan and had perpetrated the 9-11 attacks against the United States. It also aimed to removed the Taliban government from power in Afghanistan, a government which had harbored al-Qaeda and was itself seen as an illegitimate power.
The war in Iraq was pursued beginning in 2003 as a preemptive strike against the regime of Saddam Hussein and the perception that he had stockpiles of weapons of mass destruction that could be used for terroristic purposes. That perception did not turn out to be a full reality, but the war pursued regime change in Iraq nonetheless.
Answer:
The Hijra, or the relocation of Muhammad and his followers from Mecca to Medina, was important because it allowed Islam to establish a community, or umma. Whereas Muslims faced persecution from the polytheistic majority in Mecca, the people of Medina accepted Islam and used religious unity to overcome clan rivalries.