Rubuta ci gaba don wannan sakin layi - Morrison ya kasance farkon mai goyon bayan ci gaban canji a Upper Canada kuma ya halarci tarurruka don ƙarfafa canjin siyasa. Ya yi magana akai-akai game da tawaye da makamai kuma ya karfafa William Lyon Mackenzie don ci gaba da neman goyon baya ga gyaransa. Bai shiga cikin tawayen Upper Canada ba
kuma ya zauna a gidansa maimakon. Duk da haka, an kama shi kuma aka tuhume shi da cin amanar ƙasa don shirya da kuma aiwatar da tawayen kuma ba a same shi da laifi ba a shari'ar da ta biyo baya. Tsoron ƙarin caji, Morrison ya gudu zuwa Amurka kuma ya ci gaba da aikin likita. Lokacin da aka ba da afuwa ga mafi yawan mahalarta tawaye a 1843, ya koma Toronto don ci gaba da aikinsa na likita kuma ya yi aiki a kan kwamitocin likita daban-daban. Ya mutu a ranar 19 ga Maris, 1856, na cutar shan inna a Toronto.