Final answer:
The conflict with Britain and France during Johnson's administration changed the role of the federal government in terms of military development, economic policies, and foreign affairs.
Step-by-step explanation:
The conflict with Britain and France during Johnson's administration changed the role of the federal government in several ways. Firstly, it led to the development of a stronger military and a larger standing army. This was necessary to protect American interests and maintain neutrality in the conflict.
Secondly, it resulted in the implementation of economic policies such as embargoes and trade restrictions, aimed at minimizing the impact of the war on American trade. Lastly, it saw an increase in government involvement in foreign affairs, as the United States tried to navigate the complex diplomatic landscape of the European conflict.