What are the main contents of the second and third acts of Lao She's Teahouse?

Act 1: In the era when the Qing Dynasty was about to collapse, Yutai Teahouse in Beijing was still a scene of "prosperity": caged birds, fortune tellers, antique jade sellers and crickets. Wang Lifa, a smart young shopkeeper, is taken care of by all parties. However, behind this "prosperity" lies the suffocating decline of the whole society: foreign goods flooded the market, the countryside went bankrupt, eunuchs married, and patriots were arrested. \ r \ n \ r \ nAct 2: In the early years of the Republic of China, people suffered from years of civil war, and all the big teahouses in Beijing were closed. Only Wang Zhanggui improved its management, turned the backyard of the teahouse into an apartment for college students, and put a phonograph in the hall. Even so, the teahouse was robbed: refugees blocked the door, soldiers robbed the shopkeeper of money, and detectives came to extort money from time to time. \ r \ n \ r \ nAct 3: Thirty years later, Wang Zhanggui is still desperately supporting the teahouse. Japan surrendered, but the Kuomintang and American imperialism plunged the people into the disaster of civil war. Jeeps are on the rampage, and rogue agents want to occupy the teahouse that Wang Zhanggui has painstakingly managed all his life. At this time, two friends who made friends 50 years ago happened to come. One is Mr. Chang, who was arrested by the Qing court, and the other is Mr. Qin, who completely collapsed in business for half his life. The three old people scattered the paper money they found all over the floor, crying and laughing sadly. In the end, Wang Lifa was left alone. He picked up his belt, went into the inner room, looked up at the roof, and looked for a place where he could safely end his life.