slave and free states established by the Missouri Compromise; and Jackson vetoed the legislation. Texas did not come into the Union until the last days of John Tyler's administration. Slavery was the sleeping elephant in the room which no one was willing to address, including Jackson himself. So, although Jackson was himself a slave owner, he took no official position on the issue other than in typical Jackson fashion, he had no intention of seeing the Union dissolved on his watch over this or any other issue.

During the time that Andrew Jackson was president, slavery was not really a very big issue in American politics.  The Missouri Compromise had already happened and the war with Mexico had not yet happened.  This meant that the issue of slavery was pretty much settled during Jackson's time in office.  At least partly because of this, Jackson did not really do anything to promote slavery.

This does not mean that Jackson was opposed to slavery.  It simply means that slavery was not an issue and so he did not have to go around campaigning for it anymore than a modern president has to go around campaigning fo people's right to eat meat.

The one thing that sometimes connects Jackson and slavery is the "gag rule" that was imposed by Democrats in Congress at the end of Jackson's time in office.  It prohibited the House of Representatives from considering any petitions having to do with slavery.  However, since he was President, Jackson was not personally involved in this issue.

As Jackson became President, the issue of slavery was dormant.  The nation had simply accepted the condition of servitude that people of color occupied. While there might have been some limited questioning of it, the intensity and fervor that would lead to the Civil War was not evident during Jackson's time.

Thus, Jackson's support of slavery is seen in his own actions. Jackson lived his life as a Southerner who made a profit from slavery.  In his early life in the Carolinas and then as he made his fortune, Jackson did not oppose slavery. Jackson never spoke out against it and made no claims about its inhumanity. Jackson could be seen as a supporter of slavery because it helped him to generate profit and establish his name.  Jackson "prospered" as a result of slavery.  He owned a plantation that produced cotton.  The workers on this plantation were slaves, by some accounts up to 300 slaves.  At the same time, Jackson participated in military campaigns that sought to increase the Southern, slave- owning territory.  

In this, Jackson's support of slavery is once again evident.  Abolitionist Frederick Douglass was quite pointed in his critique of Andrew Jackson's support of slavery:  "Jackson has to own that he owes his farm on the banks of the Mobile to the strong arm of the Negro." Without questioning the system in which profit was tied to human misery, Jackson must be seen as a supporter of slavery:  "..wealth accumulation was tied to slavery...Jackson practiced and defended what had been the accustomed way for white men to make money for 200 years."  It is in these respects in which Jackson supported slavery.