The development of the motherland makes people proud.
Tips
usage
祖国 is emotionally charged and patriotic - it evokes the land where your ancestors lived. It is very common in speeches, songs, and patriotic contexts. In casual conversation, people simply say 中国 or 我们国家.
culture
祖 connects to 祖先 (ancestors). The concept of 祖国 ties national identity to ancestral roots - the country is not just where you live, but where your family line stretches back through generations.