Which statement best explains how the idea of manifest destiny lead to the mexican-american war? a) mexico was a barrier to achieving what many believed was america’s destiny to expand to the pacific. b) mexico believed its destiny was to annex texas, so it attacked american soldiers in texas. c) the united states was a barrier to achieving what many believed was mexico’s destiny to expand to the pacific. d) the united states believed its destiny was to annex texas, so it attacked mexican soldiers in texas.