describe the opening of the play all my sons

Act I

All My Sons takes place in a small American town in August, a few years after World War II. The events of the play occur on a single set, the back yard of the Keller home, where a tree has recently been torn down by a storm. The Kellers are solidly middle-class and have a working-class background. They are not rich, but they are financially comfortable, and there is a sense throughout the play that they worked hard to reach this state of stability. This excerpt is right from the GradeSaver Site. It ptetty much answers your question in as much detail as you want. I'll post the link below.