I think you are
Antidisestablishmentarianism
6 articles,
Antidisestablishmentarianism - and each "an" contains an additional "a".
an insect,
Ant
a calculator,
TI (Texas Instruments) as suggested by GentlePurpleRain in the comments.
a basic verb,
is
a stack exchange,
SE
four spaces,
Tab (in code styling, tabs are often set to four spaces)
a core muscle,
Ab
some males,
men
and some black goo.
tar
I have more, but I risk giving myself away too easily.
It is 28 letters long.
Title
Antidisestablishmentarianism is a political movement that developed in 19th-century Britain in opposition the Liberal Party's efforts to disestablish or remove the Church of England as the official state church, thus being the great English debate, credit to ArnaudMortier.