What became the dominant symbol of American life in the 1950’s

Automobiles and Highways

Explanation:

The automobile and the Interstate became the American symbol of individuality and freedom, and, for the first time, automobile buyers accepted that the automobile they drove indicated their social standing and level of affluence.

battle of saint-mihiel, (12–16 september 1918), allied victory and the first u.s.-led offensive in world war i. the allied attack against the saint-mihiel salient provided the americans with an opportunity to use their forces on the western front en masse.

explanation:

most people were factory or company owners.