The Municipality shall have the same boundaries as exist on the effective date of this Charter with the power and authority to change its boundaries and annex other territory contiguous thereto in the manner authorized by the laws of Ohio, except that no territory shall be detached from the Municipality, nor shall the Municipality be annexed to or merged with other body politic, nor shall the corporate existence of the Municipality be terminated, without the assent of a majority of the electors of the Municipality voting on such proposal at an election held and conducted in the manner provided by Council to the extent not provided by general law.