This is very easy to find with a simple google search. Here’s the year-to-date spending for 2023:

$1.01T social security
$673B health
$636B medicare
$623B income security
$610B defense
$494B net interest
$220B veteran benefits & services
$201B education, training, employment, and social services
$89B transportation
$74B community and regional development
$179B other

https://fiscaldata.treasury.gov/americas-finance-guide/federal-spending/

The executive branch includes the president (who is elected by the whole country) and their staff, as well as the various departments and agencies such as the FBI, USDA, NASA, etc, which are staffed by unelected government employees.

The legislative branch (Congress) consists of representatives elected by the people of each state.

The judicidal branch is the courts, and the Supreme Court is the highest court. Its 9 justices are nominated by the president and confirmed by a vote in Congress, and serve for life.