What best defines an economic system?

What was the effect of peace in europe after 1815

Abird conservation society has a database of every bird spotted by members in the past year. to make this data part of a gis would require tying each sighting to

Which of the following world and national events led to a new view of people with disabilities in the us:     a.  world war i and ii veterans with disabilities returned home after the wars.b.  john f. kennedy was elected president and had a sister with a disability.c.  the civil rights and feminist movements.d.  all of the above.