It actually had little to do with European colonial possessions overseas.
In 1962 , the house passed the 24th Amendment, voting equality
Many of the arguments that favor internal improvements financed by the government center around economic development as a result of government spending as well as the fact that infrastructure and internal improvements are public goods which will largely not be paid for by the private sector. The arguments against it are that the government shouldn't finance these projects because the market will account for it somehow. Most individuals even if they are against government spending believe that the government should be responsible for infrastructure projects.
Chief John Ross wants to assure President Lincoln that his and the Cherokee people's loyalty laid with the Union. He also expresses how Cherokee and the U.S are tied together by a series of treaties based on friendship and alliance to receive protection from the United States and no other sovereign. He affirms that despite having to reach an agreement with the confederates, people were still supporters of the Union and they showed so when the Indian Expedition took place in 1862 and how they manifest their support by fighting under the Union flag. Chief Ross was a defendant of neutrality during the Civil war, unfortunately he couldn't maintain this position and the pressure from other tribal leaders regarding their participation in the Civil War given the history they had with the north after the Trail of Tears forced relocation, most Cherokees were siding more with southern policies.
With this letter, Ross wants to express to President Lincoln that he supports the United States of America and in exchange asks him not to abandon the Cherokee people, to honor former agreements and to protect people's life and property.