Answer:
A. To protest the war effort
Porfirio Diaz was president of Mexico in XIX century. His major achievements include:
1) introducing 'paz porfiriana' (internal stability in Mexico)
2) attracting foreign investments thanks to tax and other incentives
3) providing economic growth via reforms and modernization (Mexico was compared to countries like United Kingdom or France in terms of wealth)
4) creating effective centralised government
The 19th amendment was one of them
