Tables don't break well across pages.
Do you need to present the data in columns? Can't you use a "description list" or just normal text?
Code:
<dl>
<dt>1492</dt>
<dd>Columbus arrives to the New World</dd>
</dl>
Code:
<p><b>1492</b>—Columbus arrives to the New World</p>
Also, if there is no relationship between the two columns (i.e., if it's printed as two columns only because it fits and to save paper) it's better to present it as a single column.