What even marked the beginning of ww2

The invasion of Poland in 1939

Explanation:

the soviet union wanted to impose communist governments in eastern europe.

the section of the chart that represents a point at which a bill needs approval from a majority of people in both chambers to advance is j, as this is the only section before the bill becomes law which has both rows (symbolizing the chambers) converging into one, meaning that the two parts of the congress have to approve of it before it can march on with the process.