With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: With US backing , Panama seceded from Colombia in 1903 and promptly signed a treaty with the US allowing for the construction of a canal and US sovereignty over a strip of land on either side of the structure ( the Panama Canal Zone ) .
text_B: 1903 is a location
not-entailed.