Ok please answer question 3 cuz i dont really know

What impact did new technologies in the assembly and manufacturing have on the auto industry in the 1920s

What initiatives were taken by americans to benefit the war effort? 1. americans planted home gardens to ration food for the troops. 2.american charities were established to provide aid to factory workers. 3.american companies joined together to make products more cheaply. 4.americans created clubs for promoting weapons to be used in the war.

Which of these were achievements of the safavid dynasty? check all that apply.