In 1895, he moved to the United States where he worked as editor of the Lithuanian weekly Lietuva [lt].

He then studied at the Marijampolė Gymnasium, but in the sixth year his father died and he returned to the family farm.

He also wrote about the Lithuanian National Revival for the Polish weekly Kraj [pl] in Saint Petersburg.

[1] In December 1895, Adomaitis became editor of the Lithuanian weekly Lietuva [lt] published in Chicago and continued to edit it until 1912.

[2] In addition to writing some 2,000 articles to various periodicals, he also published about 20 popular science books[4] about the planet Earth and the Solar System (1896), geography (1899, 1902, 1906), dinosaurs (1900), biology (1901), forces of nature (1904), meteorology (1907), domesticated animals and plants (1901), hygiene and microbes (1905), ethnology (1903), ancient history (1904), history of writing (1906), etc.