The Yaowarat road districts of Bangkok changed because of immigration.
In the 1780s, Chinese immigrants to the Yoawarat road. (a road in the Pra Nakon and Samphanthawong districts of Bangkok). They escaped poverty because of corruption, so Bangkok has more business.Today Yaowarat road is a community of Chinese, so you can see Chinese festivals,for example celebrate Chinese New Year and there are Chinese shops and restaurants,so there are the landmark of Bangkok.