How does Hemingway create tension in "Hills Like White Elephants"?

One of the main ways that Hemingway creates tension in this
unforgettable and, in many ways, uncompromising story is through his use of dialogue. It is clear
that what is going on beneath the apparent surface of their dialogue is an immense struggle where
the male is insisting that Jig, his lover, has an abortion, and she does not want to have this
abortion, but eventually realises that she must yield to his inexorable will. Note how the male,
in spite of his veneer of reasonableness, insists on returning to this topic of conversation even
when it is clear that she does not want to talk or think about it - he repeats that he doesn't
want her to have the abortion unless that is what she wants, but the very fact that he repeats
this time and time again indicates that this is what he wants and he is trying to manipulate her
into having the abortion whilst maintaining the position of someone who has not forced his lover
to have the abortion.

The dialogue particularly at the end builds
the tension, as Jig increasingly realises the consequences of the action she will take very
shortly:

"We can have
everything."

"No, we can't."

"We can
have the whole world."

"No, we
can't."

"We can go everywhere."

"No, we
can't. It isn't ours any more."

"It's
ours."

"No, it isn't. And once they take it away, you never get it
back."

"But they haven't taken it
away."

"We'll wait and
see."

It is clear here that Jig, with
her constant stream of negatives, is referring to the way that what is about to happen will
change things irrevocably, perhaps with a veiled reference to the baby being "taken away" so that
she can "never get it back." Thus we see the tension gradually raised throughout the story until
the end, when it is clear that Jig will go through with the abortion to try to save their
relationship.