Why the author begin with the travel to lilliput and not brobdingang?

Whatever Gulliver did not gain in perspective (in terms of size) during his time in Lilliput, he gains in Brobdingnag. His time here not only gives Gulliver an understanding of what it is like to be powerless, but it also shows Gulliver how the Lilliputians must have felt when near him. Of course this situation is even more intimidating because here there are many giants, while in Lilliput he was the only one. This is how a Lilliputian would feel in England. The differences Gulliver experiences between the two islands are heightened because of the close proximity of the trips. Gulliver feels even smaller in Brobdingnag than he would have felt if he had never journeyed to Lilliput.