States can borrow money for.

Different reasons

Explanation:

States and localities borrow to pay for infrastructure, rather than use annual tax collections and other revenues, for sound reasons. Public buildings, roads, and bridges are used for decades but entail large upfront costs; borrowing enables the state to spread out those costs

Could be for military and secure the country, for social services like busses. For example in the UK it can be borrowed to keep the NHS free for the people.