Final answer:
The spending categories that were least funded in 2010 were international affairs, science and technology, natural resources and the environment, transportation, housing, income support for the poor, community and regional development, law enforcement and the judicial system, and administrative costs of running the government.
Step-by-step explanation:
Federal government spending refers to the allocation of funds by the central government for various purposes, including defense, social programs, infrastructure, and debt servicing. The budget, determined through legislative processes, reflects the government's priorities and policies, influencing economic activity and public services at the national level.
Based on the provided information, the spending categories that were least funded in 2010 were international affairs, science and technology, natural resources and the environment, transportation, housing, income support for the poor, community and regional development, law enforcement and the judicial system, and administrative costs of running the government.