N-400
USCIS is planning to unveil a new N-400 on April 1, 2024 along with new filing fees. Several lawsuits attempting to prevent filing fees from going up have been filed all over the United States.
Historically, on or about 1440-1455, goldsmith, Johannes Gutenberg invented the movable-type printing press. Looking at the fee structure for citizenship applications USCIS is fostering we are staying in that century.