title: I want to populate the country, state, city table records in MySQL as dropdown list in frontend ReactJs and Backend using Spring boot
body: <p>I have created three tables in mysql database i.e. Country, State and City.
  I want to populate these records as dropdown based on selection(Front End React JS and Backend is Spring Boot).
  What are the API's I should create and connect them.
  Please help and Thanks in Advance</p>