What is it called when and author makes reference to something with explicitly stating it?

explanation:

omgggggg i go to k12 too : d

the most famous of all the units fighting in cuba, the "rough riders" was the name given to the first u.s. volunteer cavalry under the leadership of theodore roosevelt. roosevelt resigned his position as assistant secretary of the navy in may 1898 to join the volunteer cavalry. the original plan for this unit called for filling it with men from the indian territory, new mexico, arizona, and oklahoma. however, once roosevelt joined the group, it quickly became the place for a mix of troops ranging from ivy league athletes to glee-club singers to texas rangers and indians.

not really a history or a question at all.

explanation:

maybe this isn't the best place to ask this, maybe a social media platform like twitter or instagram? -austin