20th century In 1901, the Borough of Northampton Heights was incorporated. Starting in 1904, the borough of Bethlehem began a concerted effort to merge with its neighboring municipalities. In 1904 Bethlehem absorbed West Bethlehem followed shortly after in 1905 by Hottlesville. South Bethlehem would attempt to resist merger and incorporated themselves as their own city in 1913, however, the Supreme Court of Pennsylvania struck down their incorporation as unconstitutional in 1915 and in 1917 South Bethlehem would be annexed.
20th century In 1901, the B.orough of Northampton Heights was incorporated Starting in 1904, the borough of Bethlehem began a concerted effort to merge with its neighboring municipalities. In 1904 Bethlehem absorbed West Bethlehem followed shortly after in 1905 by Hottlesville. South Bethlehem would attempt to resist merger and incorporated themselves as their own city in 1913, however, the Supreme Court of Pennsylvania struck down their incorporation as unconstitutional in 1915 and in 1917 South Bethlehem would be annexed.