Which of the following is likely to occur in the future?

New ethnicities will be formed, and some ethnicities will be reclassified as charter groups.
New ethnicities will be formed, and old ethnicities will merge into one.
New ethnicities will be formed, and all Americans will claim one ethnicity.
Some ethnicities will be reclassified as races, and old ethnicities will merge into one.
Some ethnicities will be reclassified as races, and all Americans will claim one ethnicity.