The City of Solon shall have the same boundaries as now exist, but with power and authority to change its boundaries in the manner authorized by the laws of Ohio, except that no territory shall be detached from or annexed to the City, nor shall the City be annexed to, or merged with, any other body politic, nor shall the corporate existence of the City be terminated, without the assent of a majority of the electors of the City voting on such proposal, or the assent of the Council subject to approval by a vote of a majority of electors of the City voting on such proposal. Any such proposal shall be submitted to the electors only at a general election in such manner as the Council shall by resolution or ordinance prescribe.