Abbreviation that's a synonym for "founded," on a town sign

"My ___!" ("My mistake!")3 Fishhook's end (word hidden in "barbie")4 Antioxidant berry from a palm tree4 Aspiring singer's tape, say4 "___ the opportunity with both hands"4 Bill ___, Microsoft co-founder5 Respond to a stimulus (anagram of "crate")5 ___-enemy (biggest foe)4