[5] His involvement in the Gómez-Maceo Plan, the 1884–1886 attempt to organize further revolution after the failure of the Little War, had him travel to Guatemala and El Salvador to raise funds and recruit men.

The Government Council appointed him secretary of foreign affairs, but he resigned due to issues with President in Arms Salvador Cisneros Betancourt.

[10] There was public outrage at the suffrage grants drafted by the American administration in 1900, which only lent the right to men who owned at least $250 in assets and were literate.

In a 1907 speech during the Provisional Government of Cuba's administration, he demanded sovereignty be restored and declared that since the beginning of the 19th century, geopolitics had been consumed by American imperialism.

[10] During the 1908 Cuban general election, he was the Liberal candidate for vice president under José Miguel Gómez but ceded the position to Alfredo Zayas.

They posited an expansive eugenicist concept based on Pinard's puericulture;[7][16] it outlined a national project for maternal and child health, which were seen as linked,[17] and "took a holistic view of view of influences on human development, linking 'human fitness to a nation’s capacity for peace, order, and prosperity.

In 1913, the National Homiculture League was founded and included people such as Francisco Carrera y Jústiz and María Luisa Dolz.

To spread the idea, Hernández taught a class on homiculture and preventative sexual health at the José Martí Popular University [es].

Proposals in La Habana Province[d] that stemmed from homiculture included prenuptial medical examinations, and legal protection for women, and campaigns for improved working conditions and child nutrition.

[16] Homiculture did not receive attention from the government until President Mario García Menocal established the Children's Hygiene Service, which accepted Hernández and Ramos's proposals: inspections on wet nurses and milk and tubercular sanatoriums.

The service did not live up to the expectations of the pair as it was limited to Havana and acted as a means of surveillance on women, schools, and daycares.

28 delegates, representing 16 countries, and other unofficial members attended; included were Mexican Rafael Santamarina Sola (1884–1966), Peruvian Carlos Enrique Paz Soldán [es], and American Charles Davenport.

Ramos, supported by Davenport, suggested a white supremacist code entailing the classification of non-white immigrants and indigenous people as inferior and promoted policies of forced sterilization and racial segregation, as done in the United States.

[19] In addition to positing homiculture, Hernández modified the Tarnier foreceps and Farabeuf's pelvimeter, and developed method for an open-air symphysiotomy.

He was veiled in the Cuban Academy of Sciences rather than the Augla Magna (University of Havana) [es] due to pressure from President Ramón Grau.