In every forum, there is an option at the end of the page which says" Show threads from the…", and then it has several options, like “Last day”, “Last 10 days” etc.
For most forums (may be all), if default is “Last 10 days”. This means that threads from last 10 days would be visible.
But in History forum, the default is “Last day”. Due to this option there are very few threads visible in History forums, unless one picks another option on his own. Just showing a few threads makes it look like there is not much activity going on there. And this makes people lose interest.
I would suggest that the default option there should be the same as other forums, that is show threads from last 10 days.