Answer:Hope This helps
Explanation:Based on the information shown in the chart and my knowledge of history, the event that had the most impact on union growth was the federal government's actions to increase industrial output during World War II.
During World War II, the federal government enacted policies that encouraged the growth of unions in order to increase industrial output for the war effort. This led to a significant increase in the number of union members, with the number of members more than doubling from 1941 to 1945.
The other events mentioned in the options, the increase in the number of women working outside of the home and the creation of agricultural unions in the Midwest and West, may have had some impact on union growth but not to the extent that the federal government's actions during World War II did.
Therefore, the federal government's actions to increase industrial output had the most significant impact on union growth during the time period shown in the chart.