Final answer:
The time period of Bleeding Kansas was 1855-1856 when violent hostilities occurred due to the sectional crisis over slavery. The clashes between antislavery and proslavery advocates resulted in deaths and property loss.
Step-by-step explanation:
The time period of Bleeding Kansas was 1855-1856 when violent hostilities occurred in Kansas as a result of the sectional crisis. This intense conflict arose from the debate over slavery, and it demonstrated that the sectional crisis was evolving into a national crisis. The clashes between antislavery and proslavery advocates, such as the Sack of Lawrence and the Pottawatomie Massacre, led to numerous deaths and significant property loss.