Which countries have National Day in September?

In September, 25 countries celebrate National Day, including Slovakia, Uzbekistan, Vietnam, San Marino, Eswatini, Brazil, North Macedonia, Tajikistan, Nicaragua, Guatemala, Costa Rica, El Salvador, Honduras, Mexico, Papua New Guinea, Chile, Saint Kitts and Nevis, Nepal, Malta, Armenia, Mali, Saudi Arabia, Guinea-Bissau, Turkmenistan, and Botswana.