The correct answer to this open question is the following.
Unfortunately, you did not include the lecture. so we do not know what were the federal agencies mentioned in the lecture.
Although you forgot to include the lecture, we can help you to answer the question using one US federal agency we know.
We are going to pick the US Environmental Protection Agency (EPA).
What this agency does to promote welfare in the United States is that the Environmental Protection Agency (EPA) focuses all its resources to protect the health of the environment to protect American citizens.
EPA has established a series of programs aimed to combat air and water pollution so the United States has clean air to breathe and freshwater.
These policies are created to take care of the raw materials and natural resources in the US territory, as well as to promote regulations to have efficient use of energy, good transportation, better agriculture practices, and clean industries. US Congress creates legislation to support the implementation of these programs.