Using some online tool to create a timeline
USING THE STORY THE ZIGZAG ROAD TO RIGHTS

Mark the far left end of the line as 1770 and the far right end as 1970. Then, find the halfway point of your line and label it as 1870.
find if it is closest to the year 1770, 1870, or 1970 and use a ruler to place your event a reasonable amount of space before or after the nearest date go with ½ inch equals 5 years
As you add the relevant dates to your timeline, label advancements above the line and setbacks below the line.