The ingredients for United States involvement are…
1888 CE to 1899 CE
The ingredients for United States involvement are all present in 1898.
All that is needed is the proper national mood and a good excuse to step in.
The first is easily achieved.
The United States wants intervention.
Aroused by stories of Spanish cruelty blown out of proportion by irresponsible "yellow journalists" and by a new sense of Anglo-Saxon "racial" responsibility toward the "inferior" people of the Latin world, large sectors of public opinion clamor for United States involvement and pressure President William McKinley to intervene.
The excuse is provided by the explosion of the United States battleship U.S.S. Maine in Havana's harbor early in 1898.