How do I prevent Highcharts from truncating categories?

Question

If space is too tight, the axis labels are truncated. I'm dealing with variable categories, so I'd prefer to have them overlap rather than disappear.

Example: http://jsfiddle.net/z1axtk31/

$(function () {
    $('#container').highcharts({
        chart: {
            type: 'bar'
        },
        title: {
            text: 'Historic World Population by Region'
        },
        subtitle: {
            text: 'Source: Wikipedia.org'
        },
        xAxis: {
            categories: ['Sub-saharan Africa', 'North America', 'South America', 'East Asia', 'Middle East', 'Europe', 'Oceania', 'Ancapistan', 'North Africa', 'Mordor', 'Atlantis'],
            title: {
                text: null
            }
        },
        yAxis: {
            min: 0,
            title: {
                text: 'Population (millions)',
                align: 'high'
            },
            labels: {
                overflow: 'justify'
            }
        },
        tooltip: {
            valueSuffix: ' millions'
        },
        plotOptions: {
            bar: {
                dataLabels: {
                    enabled: true
                }
            }
        },
        legend: {
            layout: 'vertical',
            align: 'right',
            verticalAlign: 'top',
            x: -40,
            y: 100,
            floating: true,
            borderWidth: 1,
            backgroundColor: ((Highcharts.theme && Highcharts.theme.legendBackgroundColor) || '#FFFFFF'),
            shadow: true
        },
        credits: {
            enabled: false
        },
        series: [{
            name: 'Year 1800',
            data: [107, 31, 635, 203, 2, 45, 23, 201, 50, 89, 210]
        }/*, {
            name: 'Year 1900',
            data: [133, 156, 947, 408, 6, 45, 23, 166, 50, 20, 110]
        }, {
            name: 'Year 2008',
            data: [973, 914, 4054, 732, 34, 45, 23, 20, 50, 133, 100]
        }*/]
    });
});

Answer 1

Simply set:

xAxis: {
    labels: {
        step: 1
    }
}

Example