Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Birmingham, Alabama
Table title:
Sports
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Club </th><th colspan=1 rowspan=1 > League </th><th colspan=1 rowspan=1 > Venue </th><th colspan=1 rowspan=1 > Founded </th></tr>
<tr> <td colspan=1 rowspan=1 > Birmingham Barons </td><td colspan=1 rowspan=1 > Southern League baseball </td><td colspan=1 rowspan=1 > Regions Field </td><td colspan=1 rowspan=1 > 1885 </td></tr>
<tr> <td colspan=1 rowspan=1 > Birmingham Legion FC </td><td colspan=1 rowspan=1 > USL Championship </td><td colspan=1 rowspan=1 > BBVA Compass Field </td><td colspan=1 rowspan=1 > 2019 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Birmingham Iron </td><td class="highlighted"  colspan=1 rowspan=1 > Alliance of American Football </td><td colspan=1 rowspan=1 > Legion Field </td><td class="highlighted"  colspan=1 rowspan=1 > 2019 </td></tr>
<tr> <td colspan=1 rowspan=1 > Birmingham Bulls </td><td colspan=1 rowspan=1 > Southern Professional Hockey League </td><td colspan=1 rowspan=1 > Pelham Civic Center </td><td colspan=1 rowspan=1 > 2017 </td></tr>
</table>
Question:
Who introduced the Birmingham Iron?
Answer:
The Alliance of American Football, introduced the Birmingham Iron, in 2019.