Final answer:
After the September 11 attacks, many Americans responded with displays of patriotism. Will's sisters likely set up a folding table and sat outside on their front lawn as a gesture of support for the victims and their families.
Step-by-step explanation:
On September 11, 2001, after the terrorist attacks on the World Trade Center, many Americans responded with displays of patriotism. Will's sisters setting up a folding table and sitting outside on their front lawn was likely a gesture to show their support for the victims and their families. This act of solidarity was a common response among Americans during that time, as they sought to come together and support one another in the wake of the tragedy.