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The combination of a question mark and exclamation mark is called an interrobang. This exclamatory rhetorical question punctuation was coined in 1962 and is often represented by !? or ?! because the symbol is not present on standard keyboards.
1976 was the year of the American bicentennial celebration, celebrating 200 years from the signing of the Declaration of Independence in 1776. Celebrations were planned across the United States by local communities under the guidance of the state.
Interrobang. (2020). Merriam-Webster. Retrieved from https://www.merriam-webster.com/dictionary/interrobang