How 'long' should your presentation be? (Time wise)
I can think of two approaches -
1) A narrow topic discussed relatively thoroughly (a 10 foot wide river that is 20 feet deep) such as the development of sewing needles, or cutting tools, or printing processes, or how fabric is woven
2) Or a lot of topics barely touched on (A 100 foot wide river that is 6 inches deep) such as the overall history and development of quilting.
You might also take into consideration who will be in your audience. How can quilting be relevant to them?
Maybe how math is used? Maybe do a presentation on a rag quilt made from old jeans and flannel shirts? How computer programs are used in designing now (as compared to graph paper)?
Will you be doing 'show and tell'? Using charts and illustrations? Power point?