Why does the united states use foreign aid as a tool of foreign policy?

The United States uses foreign aid as a tool of foreign policy because aid can be deployed as a means of influencing nations to align their values with those of the United States. An example of such values is democracy. The United States also uses aid to promote development and to facilitate recovery in the wake of disasters.

which time period is this? or is this story fictional, i'm going to need more info to answer this question

answer; taking up arms to defend the nation;